Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0)}.
A148585
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =54a(6) =182a(7) =578a(8) =1994a(9) =6876a(10) =24510a(11) =88314a(12) =324753a(13) =1204362a(14) =4534353a(15) =17203317a(16) =65929875a(17) =254661075a(18) =990465401a(19) =3878886425a(20) =15278673944a(21) =60503855579a(22) =240843922447a(23) =962901535611
External references
- oeis: A148585